| Abbreviation | Definition |
|---|---|
| GSNI | Geological Survey of Northern Ireland |
| HEAI | Health Economics Association of Ireland |
| HEB | Honkies Eat Bacon |
| HIHI | Health Innovation Hub Ireland |
| HINI | Hostelling International Northern Ireland |
| HRSI | Human Remains Services Ireland |
| IAHC | Irish American Heritage Center |
| IAWG | Irish Association for Women in Geosciences |
| IAWM | Irish Anti War Movement |
| IBFC | Irish Board of Film Classification |
| IBL | Irish Bouldering League |
| IBNB | Irish Business Network Brazil |
| IBP | Ireland Boy Production |
| IBP | Ireland Boys Productions |
| IBTB | Irish Blood Transfusion Board |
| IBTS | Irish Blood Transfusion Service |
| ICBI | Independent Craft Brewers of Ireland |
| ICBN | Irish Childhood Bereavement Network |
| ICCG | Irish Chinese Contact Group |
| ICCI | Islamic Cultural Centre of Ireland |